[QUOTE=RugBug;7398047]
I’ve used a chain both ways and have never seen the under the chin cause any more rearing (or other bad behaviour) than an over the nose chain.
Horses actually move into pressure (think of a horse pulling back, they go up, into the pressure, not move away from it. We spend A LOT of time teaching them to move away from pressure. It’s also way the reaction to a chain over the nose is also to through the head up…and if not timed well, can lead to rearing.[/QUOTE]
I get what you’re saying but if you pull a horse down from beneath their chin (with or without a chain under the chin) their reaction is to pop their head up, not down. I have never, ever seen a horse respond to being popped under the chin by putting their head down.
I think, using your example, my experience still holds true - when a horse receives pressure under its nose it would be wisest for them to move away from the pressure by dropping their heads. Instead, they move into (I guess?) the pressure my popping their heads up. I think I mixed them up (the terminology, not the horse’s reaction) in my original post. I am admittedly very bad at what is considered moving into and moving away from pressure. It’s like having to make my hands into L’s to tell which way is left and which is right…